Ubuntu
linux package

  1. Bug #1690085
  2. Comment #73

Comment 73 for bug 1690085

Revision history for this message
Peridot (peridot) wrote :

This is still an issue even with the bionic dailies. The easiest way (read: without recompiling kernels) I have found to get it to work is to disable IOMMU in your BIOS and add "iommu=soft" to the kernel booting options in grub.

linux can then detect everything properly (all cores) and I've had zero crashes. The only issue is that it's using software IOMMU.

Without these options you will either get crashes or hangs relating to the ACPI table (booting with acpi=off will only show a single core). Lots of AMD-Vi Logged events. and irq crashes.

I believe this is related to https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1671360

I'm on a Ryzen 1800X and Biostar B350GT5.